Results 171 to 180 of about 1,856 (216)
Some of the next articles are maybe not open access.
Inherently mode-hop-free distributed bragg reflector (DBR) laser array
IEEE Journal of Selected Topics in Quantum Electronics, 2003An inherently mode-hop-free tuning of 4.5 nm was achieved with a short-active-region distributed Bragg reflector (DBR) laser. The DBR laser contains no phase-adjustment electrode, which greatly simplifies the tuning. Fast tuning of several nanoseconds and error-free operation for 2.5-Gbit/s direct modulation were also observed.
Takaaki Kakitsuka +2 more
exaly +2 more sources
Wavelength-Tunable Short-Cavity DBR Laser Array With Active Distributed Bragg Reflector
Journal of Lightwave Technology, 2006With the aim of developing a fast wavelength-tunable laser for advanced dynamic network reconfigurations or optical burst switching, a short-cavity (SC) distributed-Bragg-reflector (DBR) laser array with an active-DBR (ADBR) structure (SC-ADBR laser) was fabricated.
Hideo Arimoto +2 more
exaly +2 more sources
SPIE Proceedings, 2006
A comprehensive model for distributed Bragg Reflector (DBR) based on thin film optics is developed. Detailed refractive index calculations for GaN, AlN, AlGaN and InGaN are included in this model. Our model can predict DBR performances for index variations, layer thickness fluctuations, and different numbers of quarter-wave stack pairs in a DBR.
Ian T Ferguson, David Nicol
exaly +2 more sources
A comprehensive model for distributed Bragg Reflector (DBR) based on thin film optics is developed. Detailed refractive index calculations for GaN, AlN, AlGaN and InGaN are included in this model. Our model can predict DBR performances for index variations, layer thickness fluctuations, and different numbers of quarter-wave stack pairs in a DBR.
Ian T Ferguson, David Nicol
exaly +2 more sources
IEEE Journal of Selected Topics in Quantum Electronics, 2007
Thermal wavelength drift in a super-structure grating distributed Bragg reflector (SSG-DBR) laser is suppressed by introducing a thermal drift compensation waveguide into a DBR laser. Injecting a compensatory current into the thermal drift compensation waveguide greatly suppresses the drift, and also prevents SSG mode hopping during rapid wavelength ...
Yoshihiro Kawaguchi, H Oohashi
exaly +2 more sources
Thermal wavelength drift in a super-structure grating distributed Bragg reflector (SSG-DBR) laser is suppressed by introducing a thermal drift compensation waveguide into a DBR laser. Injecting a compensatory current into the thermal drift compensation waveguide greatly suppresses the drift, and also prevents SSG mode hopping during rapid wavelength ...
Yoshihiro Kawaguchi, H Oohashi
exaly +2 more sources
IEEE Photonics Technology Letters, 1996
We have investigated a closed-loop control system for molecular beam epitaxial growth of quarter-wavelength AlAs-GaAs distributed Bragg reflector (DBR) structures using in situ pyrometric interferometry. The quasi-sinusoidal PI data was being treated as an amplitude and phase modulated signal for control of layer thickness.
H P Lee
exaly +2 more sources
We have investigated a closed-loop control system for molecular beam epitaxial growth of quarter-wavelength AlAs-GaAs distributed Bragg reflector (DBR) structures using in situ pyrometric interferometry. The quasi-sinusoidal PI data was being treated as an amplitude and phase modulated signal for control of layer thickness.
H P Lee
exaly +2 more sources
Novel In-Plane Semiconductor Lasers XVIII, 2019
Distributed Bragg reflector tapered diode lasers (DBR-TPL) emitting at 1064 nm are highly efficient and narrowband light sources which e.g. can be used for the treatment of eye diseases including the two main causes of blindness worldwide (i.e diabetic retinopathy and age-related macular degeneration) by laser coagulation via second harmonic generation
D Feise, D Jedrzejczyk, Nils Werner
exaly +2 more sources
Distributed Bragg reflector tapered diode lasers (DBR-TPL) emitting at 1064 nm are highly efficient and narrowband light sources which e.g. can be used for the treatment of eye diseases including the two main causes of blindness worldwide (i.e diabetic retinopathy and age-related macular degeneration) by laser coagulation via second harmonic generation
D Feise, D Jedrzejczyk, Nils Werner
exaly +2 more sources
Apodized Distributed Bragg Reflector (DBR) Bends for Compact cWDM Filter
OSA Advanced Photonics Congress 2021, 2021We propose apodized DBR bends for a compact (0.0024 mm2/ch) 4 channel cWDM filter. Simulations show -39 dB sidelobe suppression, -32 dB cross-talk, and -0.05 dB insertion loss for an optimized device configuration.
Yonas Gebregiorgis +7 more
openaire +1 more source
Monolithic distributed Bragg reflector cavities in Al2O3 with quality factors exceeding one million [PDF]
, 2011 Monolithic distributed Bragg reflector (DBR) cavities with quality factors exceeding one million have been realized in aluminum oxide channel waveguides.
E H Bernhardi +2 more
exaly +2 more sources
Pure frequency modulation of a multielectrode distributed-Bragg-reflector (DBR) laser diode
IEEE Photonics Technology Letters, 1989Intensity-modulation suppressed frequency modulation (FM) is demonstrated over a 600-MHz bandwidth by using a three-electrode distributed-Bragg-reflector (DBR) laser diode (LD). A nonuniform carrier-density distribution in the active region is realized by two separated electrodes, whose push-pull modulation yields only a 0.7% intensity fluctuation per ...
O. Ishida, H. Toba, Y. Tohmori
openaire +1 more source
Dielectric-based distributed Bragg reflector (DBR) mirrors for tunable MOEMS applications
SPIE Proceedings, 2004High reflectivity Distributed Bragg Reflector (DBR) mirrors comprising of quarter wavelength stacks of epitaxial or dielectric layers are essential in various photonic active and passive devices. Our focus has been on optimizing plasma enhanced chemical vapor deposited (PECVD) Si 3 N 4 /SiO 2 (170nm/255nm ± 20nm) based DBR stacks for high reflectivity
Vicknesh Shanmugan +3 more
openaire +1 more source